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1

Electronic Resource

Neutrons produced by 1.22 GeV antiproton interactions with nuclei (2000)

von Egidy, T. ; Figuera, P. ; Galin, J. ; [et al.]

Springer

The European physical journal 8 (2000), S. 197-204

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ISSN: 1434-601X

Keywords: PACS 25.43.+t Antiproton-induced reactions – 24.60.Dr Statistical compound nucleus reactions – 24.75.+i General properties of fission

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: Inclusive neutron energy spectra were measured by time of flight using 1.22 GeV antiprotons from LEAR, CERN, as projectiles and targets from natural Al, Cu, Ag, Ho, Ta, Au, Pb, Bi, U. The sum of two Maxwellian distributions was fitted to the spectra obtained at several forward and backward angles yielding neutron multiplicities Mi and slope or temperature parameters T i for the low-energy (evaporative, i=1) and high-energy (pre-equilibrium,i=2) parts, respectively. M 1 increases with A, proportional to the nuclear volume, and M 2 is growing with A , proportional to the nuclear radius. The T parameters are nearly independent of A. The results are compared with previous multiplicity measurements with a neutron detector, intranuclear cascade calculations and neutron spectra from stopped antiproton annihilation on nuclei. With the measured proton spectra also the ratio of emitted neutrons to protons was determined for Au.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500070106

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2

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The α-12C scattering studied via the Trojan-Horse method (2000)

Spitaleri, C. ; Aliotta, M. ; Figuera, P. ; [et al.]

Springer

The European physical journal 7 (2000), S. 181-187

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ISSN: 1434-601X

Keywords: PACS: 24.50.+g direct reactions – 24.10 nuclear reactions models- and methods – 26.20.+f hydrostatic stellar nucleosynthesis

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: The Trojan-horse method has been suggested as a means to study a two-body reaction at astrophysical energies via a three-body breakup reaction. In order to test this method the 6Li(12C,α12C)2H reaction was studied in a kinematically complete experiment at an incident energy of 18 MeV. Coincidence spectra show the presence of the quasi-free α-12C scattering process. The excitation function of the three-body reaction is calculated in the plane wave impulse approximation assuming quasi-free scattering and is compared with the experimental data. Also, the excitation function of the virtual α-12C elastic scattering is extracted from the three-body reaction cross section at low deuteron momenta and compared with the behaviour of the free scattering cross section.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/PL00013592

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3

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Limiting excitation energies in fusion evaporation reactions (1993)

Bohne, W. ; Figuera, P. ; Morgenstern, H. ; [et al.]

Springer

The European physical journal 347 (1993), S. 135-143

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ISSN: 1434-601X

Keywords: 25.70.Gh ; 25.70.Jj ; 25.70.Mn

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The mass dependence of the critical excitation energy above which a hot nucleus does not decay any more by particle evaporation, has been studied in the mass range 75≦A≦130. The experimental values of the critical excitation energy have been obtained by means of a new integral method based on the analysis of the widths of the evaporation residue mass distributions as a function of the residue velocity. The obtained mass dependence appears to be stronger than expected by various models and a predicted dependence on theZ/A ratio of the decaying nucleus seems to be confirmed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01284680

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4

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Pre-equilibrium γ ray emission in different reaction mechanisms at 8 MeV/nucleon (1999)

Papa, M. ; Amorini, F. ; Cabibbo, M. ; [et al.]

Springer

The European physical journal 4 (1999), S. 69-82

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ISSN: 1434-601X

Keywords: PACS:24.30.Cz Giant resonances – 25.70.-z Low and intermediate energy heavy-ion reactions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. Recent experimental results on particles-γ coincidence measurements on the systems 12C +64Ni and 35Cl +64Ni at about 8 MeV/nucleon are interpreted as due to the effect of a Dipole pre-equilibrium emission produced during the damping of the proton-neutron relative collective motion in very deformed intermediate systems formed in the first instants of the collision. The pre-equilibrium effects are evaluated through semiclassic kinetic theories and through modified statistical approach to include non-stationary effects in Fusion processes, Massive Transfer reactions (in the 12C +64Ni system) and in Binary Dissipative reactions (in the 35Cl +64Ni system). In particular the study performed on the dipole molecular component allows to establish a link between the above phenomenon and the charge and mass transfer process in quasi-peripheral reactions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500050205

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5

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Maximum excitation energy in fusion-evaporation reactions from light particle multiplicity measurements in32S+58Ni at 25 MeV/A (1995)

Figuera, P. ; Bohne, W. ; Drescher, B. ; [et al.]

Springer

The European physical journal 352 (1995), S. 315-320

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ISSN: 1434-601X

Keywords: 25.70.Gh ; 25.70.Jj

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract By using two 4π detector systems for charged particles and neutrons, we measured the evaporated light particles emitted in coincidence with evaporation residues (ER) produced in the reaction32S+58Ni atE(32S) ≈ 820 MeV. From the analysis of the light particle multiplicities as a function of the ER velocity, we extracted the maximum excitation energy reached in fusion evaporation reactions for the studied system.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01289504

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